package com.ruoyi.common.security.service;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.ruoyi.common.core.constant.CacheConstants;
import com.ruoyi.common.core.constant.SecurityConstants;
import com.ruoyi.common.core.utils.JwtUtils;
import com.ruoyi.common.core.utils.ServletUtils;
import com.ruoyi.common.core.utils.StringUtils;
import com.ruoyi.common.core.utils.ip.IpUtils;
import com.ruoyi.common.core.utils.uuid.IdUtils;
import com.ruoyi.common.redis.service.RedisService;
import com.ruoyi.common.security.utils.SecurityUtils;
import com.ruoyi.system.api.model.LoginUser;

/**
 * token验证处理
 * @author ruoyi
 */
@Component
public class TokenService {
    private static final Logger log = LoggerFactory.getLogger ( TokenService.class );

    @Autowired
    private RedisService redisService;

    protected static final long MILLIS_SECOND = 1000;

    protected static final long MILLIS_MINUTE = 60 * MILLIS_SECOND;

    private final static long TOKEN_EXPIRE_TIME = CacheConstants.EXPIRATION;

    private final static String ACCESS_TOKEN = CacheConstants.LOGIN_TOKEN_KEY;

    private final static Long TOKEN_REFRESH_THRESHOLD_MINUTES = CacheConstants.REFRESH_TIME * MILLIS_MINUTE;

    /**
     * 创建令牌
     */
    public Map<String, Object> createToken (LoginUser loginUser) {
        String token = IdUtils.fastUUID ();
        Long userId = loginUser.getSysUser ().getUserId ();
        String userName = loginUser.getSysUser ().getUserName ();
        loginUser.setToken ( token );
        loginUser.setUserid ( userId );
        loginUser.setUsername ( userName );
        loginUser.setIpaddr ( IpUtils.getIpAddr () );
        refreshToken ( loginUser );

        // Jwt存储信息
        Map<String, Object> claimsMap = new HashMap<String, Object> ();
        claimsMap.put ( SecurityConstants.USER_KEY, token );
        claimsMap.put ( SecurityConstants.DETAILS_USER_ID, userId );
        claimsMap.put ( SecurityConstants.DETAILS_USERNAME, userName );

        // 接口返回信息
        Map<String, Object> rspMap = new HashMap<String, Object> ();
        rspMap.put ( "access_token", JwtUtils.createToken ( claimsMap ) );
        rspMap.put ( "expires_in", TOKEN_EXPIRE_TIME );
        return rspMap;
    }

    /**
     * 获取用户身份信息
     * @return 用户信息
     */
    public LoginUser getLoginUser () {
        return getLoginUser ( ServletUtils.getRequest () );
    }

    /**
     * 获取用户身份信息
     * @return 用户信息
     */
    public LoginUser getLoginUser (HttpServletRequest request) {
        // 获取请求携带的令牌
        String token = SecurityUtils.getToken ( request );
        return getLoginUser ( token );
    }

    /**
     * 获取用户身份信息
     * @return 用户信息
     */
    public LoginUser getLoginUser (String token) {
        LoginUser user = null;
        try {
            if ( StringUtils.isNotEmpty ( token ) ) {
                String userkey = JwtUtils.getUserKey ( token );
                user = redisService.getCacheObject ( getTokenKey ( userkey ) );
                return user;
            }
        } catch ( Exception e ) {
            log.error ( "获取用户信息异常'{}'", e.getMessage () );
        }
        return user;
    }

    /**
     * 设置用户身份信息
     */
    public void setLoginUser (LoginUser loginUser) {
        if ( StringUtils.isNotNull ( loginUser ) && StringUtils.isNotEmpty ( loginUser.getToken () ) ) {
            refreshToken ( loginUser );
        }
    }

    /**
     * 删除用户缓存信息
     */
    public void delLoginUser (String token) {
        if ( StringUtils.isNotEmpty ( token ) ) {
            String userkey = JwtUtils.getUserKey ( token );
            redisService.deleteObject ( getTokenKey ( userkey ) );
        }
    }

    /**
     * 验证令牌有效期，相差不足120分钟，自动刷新缓存
     * @param loginUser
     */
    public void verifyToken (LoginUser loginUser) {
        long expireTime = loginUser.getExpireTime ();
        long currentTime = System.currentTimeMillis ();
        if ( expireTime - currentTime <= TOKEN_REFRESH_THRESHOLD_MINUTES ) {
            refreshToken ( loginUser );
        }
    }

    /**
     * 刷新令牌有效期
     * @param loginUser 登录信息
     */
    public void refreshToken (LoginUser loginUser) {
        loginUser.setLoginTime ( System.currentTimeMillis () );
        loginUser.setExpireTime ( loginUser.getLoginTime () + TOKEN_EXPIRE_TIME * MILLIS_MINUTE );
        // 根据uuid将loginUser缓存
        String userKey = getTokenKey ( loginUser.getToken () );
        redisService.setCacheObject ( userKey, loginUser, TOKEN_EXPIRE_TIME, TimeUnit.MINUTES );
    }

    private String getTokenKey (String token) {
        return ACCESS_TOKEN + token;
    }
}